Improvement in valves of steam emotes



L. D. BARTLETTJ VALVE 0E STEAM ENGINE..

No. 61,141. Patented Jan. 15, 18.67.

TOMTH teints gamut @ffies LOUIS D. BARTLETT, OF FITCHBURG, MASSACHUSETTS, ASSIGNOR TO THE PUTNAM-MACHINE COMPANY, OF SAME PLAGE.

Leim Patent N9. 61,141, sans January 15, 1867.

IMPROVEMENT IN vVALVES OF ISTEA ENGINES. 4

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TO ALL WHOM IT MAYCONCERN:

Be it known that I, LOUIS I). BARRETT, of Fitchburg, in the county of Worcester, and State of Massachusetts, have iii-.vented certain improvements iIrYalve-Chests for Steam Engines, ofwhich the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in whichy Figure 1 is a lside eleva-tion of a steam engine having my improved valve-chest applied thereto.

Figure 2 is 'a horizontal section through the cylinder and valve-chests;

Figure -3 is a ,vertical section through the centre of one of the valve-chests (enlarged.)

Figure 4 is a rear elevation of one oi' the valve-chests (enlarged.)

Figure 5 is a transverse vertical section on the line y y ot' g. 4.

My invention consists in a simple and compact arrangement and construction ofthe valve-chcsts'anfl sttm passages of engines where poppet-valves are employed, whereby the dimensions of .the chest can be reduced, and great facility afforded for removing the'valves when cleaning or repairing is required. I

To enable others skilled in the art to understand and use my invention, I will proceed to describe the manner in which I have carried it out.

In the said drawings, A is the'cylinder,to `cach end of which is secured a valve-chest, B, within which are ,placed the steam-valves O and exhaust-valves D, the stems a b of which are operated by the levers c, which are raised bycams on the revolving shaft E, in a manner similar to that described in the Letters Patent of the United States granted to Charles II.Brown and Charles Burleigh ou the ifteenth day of January, A. D. 1856, the steam-valves being so connected with the governor that 'the steam will be cut oil' at any point of the stroke, according to the amount of work 'upon the engine, in a well-known manner. F is the inlet steam pipe through which the steam passes into the passage Gr, whence it passes to the valve-chests B, and through the valves C, into the cylinder A: The construction of these chests andthe arrangement of their steam passages being precisely alike. I will describe one only, referring particularly to figs. 2, 3, 4,' and 5. The interior of the chest is cast with two boxes or casings, H I, upon which are the upper vand lower seats of'the steam and exhaust-valves C D, the stems a Zr of which pass through'the bottom of the chest, while their upper ends are guided in circular blocks or disks, d, on the underside ci' the covering-platese, which fit. into openings', f, made through the top of the chest, to which the plates are bolted; and when these plates are removed the valvesean. be readily with'- drawn for cleansing or repairs, the lower disks, g 7i, of the valves being of smaller diameter than the upper ones, ik, so as to allow of this being' done., The interior of the chest is divided into two portions, 6 and 7,.by`a partition, l, so that the steamin passing from the passage G, enters the portion 6 of the chest, and surrounds the box H, but has no communication with the portion 7 except when the valve C is raised, when it passes into the portion 7, surrounding the box I, and thence by the passage m (fig. 2) to the cylinder A. When the steamvalveC is closed and the exhaust-valve Dv opened, the exhaust steam passes by the passage m to the portion 7 of the chest, and 'thence `into the box I, the space within which is in' constant communication with the exhaust passage J, and is entirely shut-eff from the portion 7, except through the opening commanded by the valve D when thelatter'is raised from its seat.

The above-described valvefcliest is simple, compact, and economical in its construction, the parts being few and easily lcast; while the arrangement oi' its steam passages is such that the disks of both its steam and exhaust-valves can be placed very near together on Vtheir stems, by which a great advantage is gained, as the.

VS'lizrirter the stems between the valve-disks, the less the liability of their longitudinalexpansion from ythe heat which they are exposed, which often seriously alteets the position and tit of the upper valvel'disks on theirseats;

and this constructionalso allows of the lower disks being made of smaller diameter than theupper ones, so that l the valves may be readily withdrawn for cleansing or repairs, by simply removing the covering plates from the top. of the chest. l A

' Claim.

What I -cluiln as my invention, and desire to secure by Letters Patent, is

The arrangement of theeasings, steam passages, and valves, within the steam-chest, in relation to each other, and operat-inf, 1 r substantially as described. v i f 4 LOUIS DBARTLETT.

Witnesses:

C. B'unLmGn,

JOHN Bonner. 

